I'm guessing you're talking about the different ports that may be used for whatever services are being hosted on your servers, correct?

The easiest way I can think of would be to use nmap to scan each server and let it report back with what's open and what the ports are used for. Obviously if it finds a port that's not standard then it may not me able to tell you exactly what it is for... at minimum this will give you a good working list and you can go from there.

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